Walker has watched his line slip to .228/.338/.298 during the slump. He'll try to turn things around when the Pirates face the Brewers this weekend.
"No headaches or anything," Plouffe told the Pioneer Press. "I pretty much feel normal. As far as any timelines, it's still one step at a time."
Plouffe was scheduled to undergo a full-impact test Thursday to determine whether his injury was a concussion.
Rizzo's line has fallen to .256/.320/.489 with the slump, but he does have 10 home runs on the year. He'll try to stop his skid this weekend against the Reds.
"As we continue to ramp up the physical work and the physical activity, the information that we get back and how he responds to that is certainly helpful as far as our decision-making going forward,'' manager John Farrell said.
Victorino has missed the last three games since leaving Monday's 6-4 loss to the White Sox with a tight left hamstring. He is hitting .283 with two home runs and 10 RBI in 127 at-bats.
With Mark Teixeira set to return from the disabled list in the coming weeks,
"I'm not too worried. I would like to see if I can coexist here," Overbay told MLB.com Thursday. "I like it. This is fun. I was on the other side, and you don't get to experience this. I'm very surprised; it was a good surprise, but I'm very surprised at how good these guys are in the clubhouse and as far as being teammates and stuff."
Overbay has a .250/.286/.467 slash line with seven home runs and 25 RBI. Of his 38 hits this season, 18 have been for extra bases. Overbay, who homered Monday, has been held with out a hit in his last nine at-bats.
Marte reached on an infield single in the first inning and promptly stole second, his 11th steal of the season. He came around to score on a single by Andrew McCutchen, the first of two runs he would score in the first two innings.
He finished 2 for 3 with a walk, two runs scored and a stolen base, as the Pirates won, 4-2. He is hitting .310 on the season.
Weaver struck out nine while allowing one run in a start during extended spring training Wednesday. He's made just two starts for the Angels this season, allowing six earned runs in 11 innings.
McCutchen went 3 for 4 with two runs driven in and one run scored, in a 4-2 win. All three of his hits were singles, but he added a pair of stolen bases, giving him 12 on the season on 13 attempts.
McCutchen has batting .462 over the last six days, raising his batting average from .260 to .291.
Grilli induced a fly ball out on the first batter he faced, and then set down the next two on strikes to preserve a 4-2 win. Grilli needed just 14 pitches to end his outing and lower his ERA to 1.25.
Grilli has a league-leading 19 saves in 19 appearances, to go along with his sterling ERA. He has struck out 34 batters and walked just five in 21 2/3 innings.